the day president obama appeared at oakland fox theater. large contingent of police were outside to handle problems that could arise from protestors. many of the officers said they had trouble communicating on the 2 way radios. there had been numerous complaints before about the glitches of the new radio system which had just been installed in 2011, the year before. it had been riddled with inference and glitches right from the start. barry heads the police officer association. >> basically try to key the mike and doesn't work for variety of different reasons. and you never know the time or place when that is going to actually breakdown. >>reporter: this report confirms what an internal city investigation found a month after the president visit. that cell sites were affecting the city public safety radio system. that the signal were bleeding into radio channel causing sporadic inference. as of two months ago, 43 cell sites have been tested. a little over half of them were resolved. most were at&t towers. donlin says communication may have i